/usr/share/doc/libmono-zeroconf-cil-dev/changelog.Debian.gz is in libmono-zeroconf-cil-dev 0.9.0-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmono-zeroconf-cil-dev/../libmono-zeroconf1.0-cil/changelog.Debian.gz